Removing and Installing/Replacing Inlet Camshaft

11 31 025 Removing And Installing/Replacing Intake Camshaft (N55)

Special tools required:







Necessary preliminary tasks:
- Remove cylinder head cover.
- Remove intake adjuster.
- Remove intermediate lever.
- Adjust valve timing.







NOTE: All bearing caps are identified with numbers from 1 to 6.

The front bearing cap is a thrust bearing and does not have an identification.
Release screws on thrust bearing cover.
Release screws on all bearing caps 1 to 6
Set all bearing caps down in special tool 11 4 481 in a neat and orderly fashion.







Remove intake camshaft (2) towards top.

Installation note:
Clean all bearing positions and lubricate with oil.

Check plain rectangular compression rings (1) for damage.







IMPORTANT: Plain rectangular compression rings (1) can easily break.

Plain rectangular compression rings (1) are engaged at joint.
Press plain rectangular compression rings (1) apart upwards and downwards and removed towards front.

Installation note:
Install plain rectangular compression ring on new intake camshaft.







IMPORTANT:
Marks of intake and exhaust camshafts are different.
Mixing up the intake and exhaust camshaft will result in engine damage.

A Exhaust camshaft.
E Intake camshaft







Install intake camshaft so that the latch mechanism of the plain rectangular compression rings (1) does not point to a contact point of the bearing cap
Centre latch mechanism of the plain rectangular compression rings with the bearing cap.

NOTE: Image of the exhaust camshaft.







Insert intake camshaft so that data code (1) on mounting flats points upwards.







Position intake camshaft (1) so that cams point upwards at an angle and to the left.







NOTE: All bearing caps are identified with numbers from 1 to 6.

The front bearing cap is a thrust bearing and does not have an identification.
Insert screws on all bearing caps 1 to 6.
Insert screws on thrust bearing cover.
Tightening torque 11 31 3AZ.







Assemble engine.